Here’s a slide show creation tool I found called Emaze. It’s recommended as being somewhere between PowerPoint and Prezi. The tool is free but you are required to sign-up with an email address.
There is a selection of templates to choose from in both 2D and 3D formats. After selecting a template you can add slides from the gallery, edit the text, and add images from your computer or the web. There is also a “shapes” gallery to select from. YouTube video can be added by copying and pasting the URL or you can paste a YouTube video link directly on the surface of a slide. The editor looks to be intuitive and easy to use. When you are done you can save and preview. Sharing is easy; just send a link to the presentation via email.
Have a look at http://www.emaze.com